Use different BUILD_DIRs and STAGING_DIRs for different targets

Makefile

@@ -208,6 +208,7 @@ config: FORCE
 	+$(GLUONMAKE) prepare-tmpinfo
 	( \
 		cat $(GLUONDIR)/include/config $(GLUONDIR)/targets/$(GLUON_TARGET)/config; \
+		echo 'CONFIG_BUILD_SUFFIX="gluon-$(GLUON_TARGET)"'; \
 		echo '$(patsubst %,CONFIG_PACKAGE_%=m,$(sort $(filter-out -%,$(GLUON_DEFAULT_PACKAGES) $(GLUON_SITE_PACKAGES) $(PROFILE_PACKAGES))))' \
 			| sed -e 's/ /\n/g'; \
 		echo '$(patsubst %,CONFIG_GLUON_LANG_%=y,$(GLUON_LANGS))' \

include/config

@@ -1,6 +1,8 @@
 CONFIG_IMAGEOPT=y
 # CONFIG_PER_FEED_REPO is not set
 
+CONFIG_DEVEL=y
+
 CONFIG_BUSYBOX_CUSTOM=y
 CONFIG_BUSYBOX_CONFIG_SHA512SUM=y
 # CONFIG_BUSYBOX_CONFIG_FEATURE_PREFER_IPV4_ADDRESS is not set